Power control for power amplifiers
Aspects of a system for improving efficiency over power control for linear and class AB power amplifiers may include a current source circuit that enables determination of a bias current level for a PA circuit within an IC die based on an amplitude of an input modulation signal. The PA circuit may enable generation of an output signal based on a differential input signal and the input modulation signal to the current source circuit. A generated bias voltage may be applied to a transformer external to the IC die, but internal to an IC package containing the IC die and/or a circuit board containing the IC package. One or more amplifier bias voltage levels may be applied to the PA circuit wherein the amplifier bias voltage levels may be derived from the generated bias voltage level and/or the determined bias current level.
1. A wireless communication system comprising:
a circuit that enables determination of a bias current for an amplifier in said wireless communication system based on an input modulation signal;
said amplifier generating an output signal based on a differential input signal to said amplifier and said input modulation signal;
wherein at least one amplifier bias voltage is derived from said bias current, and wherein said at least one amplifier bias voltage is applied to said amplifier.
2. The wireless communication system of claim 1 , wherein said differential input signal comprises signal phase information.
3. The wireless communication system of claim 1 , wherein said input modulation signal comprises signal amplitude information.
4. The wireless communication system of claim 1 , wherein a phase of said output signal is based on said differential input signal.
5. The wireless communication system of claim 1 , wherein an amplitude of said output signal is based on said input modulation signal.
6. The wireless communication system of claim 1 , wherein a phase of said output signal is based on said differential input signal, and an amplitude of said output signal is based on said input modulation signal.
7. The wireless communication system of claim 1 , wherein said differential input signal comprises signal phase information, and wherein said input modulation signal comprises signal amplitude information.
8. The wireless communication system of claim 4 , wherein said differential input signal comprises signal phase information.
9. The wireless communication system of claim 5 , wherein said differential input signal comprises signal phase information.
10. The wireless communication system of claim 4 , wherein said input modulation signal comprises signal amplitude information.
11. The wireless communication system of claim 5 , wherein said input modulation signal comprises signal amplitude information.
12. The wireless communication system of claim 1 , wherein said input modulation signal is inputted to a current supply.
13. The wireless communication system of claim 12 , wherein said current supply generates said bias current.
14. A method for amplifying signals in a wireless communication system, said method comprising:
determining a bias current for an amplifier based on an input modulation signal;
generating an output signal from said amplifier based on a differential input signal to said amplifier and said input modulation signal;
deriving at least one amplifier bias voltage from said bias current;
applying said at least one amplifier bias voltage to said amplifier.
15. The method of claim 12 , wherein said differential input signal comprises signal phase information.
16. The method of claim 12 , wherein said input modulation signal comprises signal amplitude information.
17. The method of claim 12 , wherein a phase of said output signal is based on said differential input signal.
18. The method of claim 12 , wherein an amplitude of said output signal is based on said input modulation signal.
19. The method of claim 12 , further comprising providing said input modulation signal to a current supply.
20. The method of claim 19 , wherein said current supply generates said bias current.